Demodulation reference signal mapping according to comb configuration
A communication system comprises at least a base station device and a terminal device. The terminal device transmits a demodulation reference signal associated with a physical channel, receives a configuration of comb of the demodulation reference signal, and transmits the demodulation reference signal mapped based on the configuration of comb. The base station device transmits a configuration of comb of a demodulation reference signal related to a physical channel.
1. A terminal device comprising:
a transmitter configured to transmit a demodulation reference signal associated with a physical channel; and
a receiver configured to receive a configuration of comb of the demodulation reference signal;
wherein the demodulation reference signal is mapped based on the configuration of comb,
the demodulation reference signal is defined based on an orthogonal sequence and a cyclic shift,
a pattern of the orthogonal sequence and the cyclic shift is expanded in a case that the terminal device is configured with the comb of the demodulation reference signal,
the receiver is configured to receive a downlink control information format, and
a pattern of the comb, the cyclic shift, and the orthogonal sequence for each antenna port are determined based on a cyclic shift field in the downlink control information format in the case that the terminal device is configured with the comb of the demodulation reference signal.
2. A base station device comprising:
a transmitter configured to transmit a configuration of comb of a demodulation reference signal related to a physical channel and a configuration of an orthogonal sequence,
wherein the configuration of an orthogonal sequence is expanded based on the configuration of the comb and a cyclic shift,
the transmitter is configured to transmit a downlink control information format, and
a pattern of the comb, the cyclic shift, and the orthogonal sequence for each antenna port are determined based on a cyclic shift field in the downlink control information format.
3. A transmitting method in a terminal device comprising:
transmitting a demodulation reference signal associated with a physical channel; and
receiving a configuration of comb of the demodulation reference signal; and
receiving a downlink control information format,
wherein the demodulation reference signal is mapped based on the configuration of comb,
the demodulation reference signal is defined based on an orthogonal sequence and a cyclic shift,
a pattern of the orthogonal sequence and the cyclic shift is expanded in a case that the terminal device is configured with the comb of the demodulation reference signal, and
a pattern of the comb, the cyclic shift, and the orthogonal sequence for each antenna port are determined based on a cyclic shift field in the downlink control information format in the case that the terminal device is configured with the comb of the demodulation reference signal.